pragma solidity ^0.5.0;

import "@openzeppelin/contracts/math/SafeMath.sol";
import "./Ktoken.sol";

contract KEther is KToken {
    using SafeMath for uint256;

    constructor (address invokerAddress)
    public
    KToken(address(1), invokerAddress, "Kollateral Ether", "kETH", 18)
    { }

    function mint()
    external
    payable
    returns (bool)
    {
        return mintInternal(msg.value);
    }

    function isKEther() public view returns (bool) {
        return true;
    }

    function totalReserve()
    public
    view
    returns (uint256)
    {
        return address(this).balance;
    }

    function transferUnderlyingInternal(address to, uint256 amount)
    internal
    returns (bool)
    {
        address payable toPayable = address(uint160(to));
        require(address(this).balance >= amount, "KEther: not enough ether balance");
        toPayable.transfer(amount);
        return true;
    }

    function () external payable { }
}